In-plane ordering of O vacancies in a high-Tc cuprate superconductor with compressed Cu-O octahedrons: a first-principles cluster expansion study

Yunhao Li, Shiqiao Du, Zheng-Yu Weng +1

A recently discovered high-Tc cuprate superconductor Ba2CuO${}_{4-\delta }$ exhibits exceptional Jahn-Teller distortion, wherein the CuO6 octahedrons are compressed along the c axis. As a…